/*
 * Copyright 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Web.UI;
using System.Web.UI.WebControls;

namespace Spring.Web.UI.Controls;

/// <summary>
/// This validator allows for validating a CheckBox's "Checked" state.
/// </summary>
/// <author>Erich Eichinger</author>
[ToolboxData("<{0}:RequiredCheckBoxValidator runat=\"server\" ErrorMessage=\"RequiredCheckBoxValidator\"></{0}:RequiredCheckBoxValidator>")]
public class RequiredCheckBoxValidator : AbstractBaseValidator
{
    /// <summary>
    /// Validates this validator's properties are set correctly.
    /// </summary>
    /// <returns></returns>
    protected override bool ControlPropertiesValid()
    {
        string controlName = this.ControlToValidate;
        if (controlName.Length == 0)
        {
            return base.ControlPropertiesValid();
        }

        return true;
    }

    /// <summary>
    /// Returns the state of the checkbox's Checked property
    /// </summary>
    /// <returns></returns>
    protected override bool EvaluateIsValid()
    {
        CheckBox controlToValidate = this.NamingContainer.FindControl(this.ControlToValidate) as CheckBox;
        if (controlToValidate == null)
        {
            return false;
        }

        return controlToValidate.Checked;
    }

    /// <summary>
    /// Adds attributes required for clientside validation
    /// </summary>
    /// <param name="writer"></param>
    protected override void AddAttributesToRender(HtmlTextWriter writer)
    {
        base.AddAttributesToRender(writer);
        if (base.RenderUplevel)
        {
            string controlId = this.ClientID;
            writer = base.EnableLegacyRendering ? writer : null;
            base.AddExpandoAttribute(writer, controlId, "evaluationfunction", "RequiredCheckBoxValidatorEvaluateIsChecked", false);
            base.AddExpandoAttribute(writer, controlId, "initialvalue", "", true);
        }
    }

    /// <summary>
    /// Ensures the evaluation javascript functionblock is registered
    /// </summary>
    /// <param name="e"></param>
    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
        if (!base.IsClientScriptBlockRegistered(typeof(RequiredCheckBoxValidator), "RequiredCheckBoxValidatorEvaluateIsChecked"))
        {
            base.RegisterClientScriptBlock(
                typeof(RequiredCheckBoxValidator)
                , "RequiredCheckBoxValidatorEvaluateIsChecked"
                ,
                @"
<script type=""text/javascript"">
function RequiredCheckBoxValidatorEvaluateIsChecked(val)
{
  var control;
  control = document.getElementById(val.controltovalidate);
  return control.checked;
}
</script>
"
            );
        }
    }
}
